Abstract

Ascaridia galli infection remains one of the most significant nematode diseases affecting poultry, particularly in free-range and deep-litter systems. This case report describes a severe outbreak of Ascaridia galli infection in a commercial layer flock, highlighting its clinical, parasitological, and pathological manifestations. Affected birds exhibited signs of chronic helminthosis, including dullness, anorexia, pale combs, and ruffled feathers, accompanied by a significant drop in egg production from 85% to 60%. Gross lesions such as intestinal distension, catarrhal enteritis, mucosal congestion, and rare intestinal perforations with peritonitis were observed, indicating a high-intensity parasitic burden. Diagnosis was confirmed through morphological identification of adult worms and microscopic detection of characteristic eggs. Therapeutic administration of (100%) piperazine citrate at 5g in 3 litres of clean drinking water per 15 birds and repeated after 2 weeks led to clinical improvement and recovery in productivity. This case underscores the economic impact of A. galli infections. It emphasizes the need for routine deworming, strict hygiene, and biosecurity measures to prevent reinfection and maintain flock health in deep-litter poultry systems.

Key words: Ascaridia galli, laying hens, nematode, poultry health